This study investigated the migratory fish spawning within reservoirs of Machadinho and Itá dams (upper Uruguay River, Brazil) its relationship to environmental variables. Sampling was conducted in lotic region river two sites between dams' reservoirs: (main river) Ligeiro (tributary). included nine consecutive reproductive periods (RP) spanning period from 2001 2010 at night on water surface using cylindrical-conical plankton nets (0.5 mm mesh); variables were also recorded. The species...

Abstract: Aim This study aimed to assist in guiding research with eggs and larvae of continental fish Brazil, mainly the knowledge early development, as well present state art point out gaps future directions for development researches area. Methods The literature review was carried electronic platforms studies were examined investigate whether any addressed morphological description and/or larvae. Results We found 121 studies, including scientific articles, theses, dissertations, chapters...

Abstract Dam presence results in heterogeneous aquatic environments that probably favour segregation of ichthyoplankton developmental stages. Therefore, the present study tested hypothesis dams Upper Uruguay River create favouring stages and also separate species with different reproductive tactics. Ichthyoplankton were captured bimonthly during 2002–2015 25 sampling stations grouped by fluviometric characteristics. Sampling was performed at night, cylindrical–conical plankton nets light...

In captive conditions, most neotropical migratory species do not have the necessary incentive to complete gonadal maturation and spawning, which require induction techniques, usually with use of hormones. Numerous studies therefore focused on finding an effective hormonal treatment induce reproduction for each species. A standard was successfully developed these species, consists two doses Carp Pituitary Extract (CPE), totaling 5.5 mgCPE/kg fish. However, best strategy subsequent...

This study aimed to evaluate the temporal distribution of fish eggs and larvae in Forquilha river (upper Uruguay river/Brazil) its relationship with environmental variables. Ichthyoplankton abiotic factors were sampled from September 2006 August 2007. At laboratory, samples sorted identified lowest possible taxonomic level. For data analysis we applied One-way Anova, Tukey’s test, Pearson correlation PCA. In this 200 308 collected, showing differences influence factors. Larvae all stages...

Abstract Aim This study aimed to evaluate the spatial and temporal distribution of ichthyoplankton in Peri Lagoon, a coastal freshwater lagoon Brazil. Methods Ichthyoplankton samples were collected every two months from June 2008 April 2010 with 500 µm conical-cylindrical planktonic nets at five sampling stations. Results In total, 181 fish eggs 1,315 larvae, representing estuarine species, captured. The most representative species Awaous tajasica, Ctenogobius sp1, Platanichthys platana....

Light traps are devices utilized in biomonitoring studies across various aquatic environments. Although light used globally, few report their efficacy capturing fish larvae the Neotropics. To address this gap, study aimed to assess of six species commonly found Neotropical rivers. Additionally, we evaluate effect color on larval capture. accomplish this, selected from species: Cyprinus carpio, Ctenopharingodon idella, Piaractus mesopotamicus, Pimelodus maculatus, Prochilodus lineatus, and...

O Rio Jequitinhonha está localizado em uma região com elevada diversidade de peixes água doce endêmicos. Atualmente, encontra-se fragmentado no seu trecho médio pela Usina Hidrelétrica Irapé, e pouco se conhece sobre a dinâmica ovos larvas nessa região. Nesse sentido, este estudo teve como objetivos apresentar um panorama da distribuição espacial temporal assembleia alto-médio relacioná-las às características dos ambientes existentes área. As amostragens foram realizadas cada três dias entre...

Identifying spawning and recruitment areas of Neotropical migratory fish is an important conservation issue, because it allows to define connectivity between habitats used during the initial life cycle these species. In this sense, objective study was delimit three (Megaleporinus obtusidens, Salminus brasiliensis Prochilodus lineatus) along altitude gradient Uruguay River. Samplings ichthyoplankton juveniles were applied with five different fishing devices in four river stretches, one...

This study examined the fish communities of Peri Lagoon in southern Brazil to aid development an effective management plan because area is under threat from human activities. Sampling fauna, ichthyoplankton and limnological data were compared between sites, differing by habitat type characteristics such as depth, substratum composition vegetation type. Results significantly related site, with highest diversity abundance recorded at shallow vegetated sites. A total 14 species throughout...

Abstract We evaluated the reproductive dynamics of two fish species, Lycengraulis grossidens and Platanichthys platana, in a subtropical freshwater coastal lagoon (Peri Lagoon) Brazil. Samples were collected from nine sites every months June 2008 to April 2012. Different fishing methods used capture larvae, juveniles, adults. Limnological variables obtained using multiparameter probe. More females than males both species chi-square test (χ2) was confirm that sex ratio female-biased. Large...

Abstract The golden mussel ( Limnoperna fortunei ) is an invasive bivalve that has established itself in several South American river systems, impacting ecosystem functioning. Reservoir cascades provide their larvae with the means of rapid dispersal, but relationship between environmental variables and larval stage structure remains unclear. In this study, density four L. stages was assessed a cascade five reservoirs upper Uruguay River Basin associated spatiotemporal variation parameters....

Abstract The golden mussel ( Limnoperna fortunei ) is an invasive bivalve that has established itself in several South American river systems, impacting ecosystem functioning. Reservoir cascades provide their larvae with the means of rapid dispersal, but relationship between environmental variables and larval stage structure remains unclear. In this study, density four L. stages was assessed a cascade five reservoirs upper Uruguay River Basin associated spatiotemporal variation parameters....

<title>Abstract</title> Studies of ichthyoplankton in Neotropical environments have become increasingly relevant for environmental inventories and monitoring programs designed to evaluate anthropogenic impacts on ichthyofauna, especially potamodromous fish. These studies made advancements including progress improving techniques data collection processing. However, challenges remain the taxonomic identification organisms, eggs. Identification initiatives been hindered by paucity literature...